Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Que distrito tem Riley Joseph Wilson como titular?
 ###Tabelas: CREATE TABLE  (_id AUTO_INCREMENT PRIMARY KEY, District VARCHAR, Incumbent VARCHAR, Party VARCHAR, First elected INT, Result VARCHAR, Candidates VARCHAR) CREATE TABLE vowel_alone (vowel_alone_id AUTO_INCREMENT PRIMARY KEY, Letter VARCHAR, American VARCHAR, British VARCHAR, Australian VARCHAR, Examples VARCHAR) CREATE TABLE 2005–present (2005–present_id AUTO_INCREMENT PRIMARY KEY, Season INT, Player VARCHAR, Club VARCHAR, Goals INT, Games INT, Rate INT) CREATE TABLE railway_stations_currently_in_use (railway_stations_currently_in_use_id AUTO_INCREMENT PRIMARY KEY, Station (and code) VARCHAR, Managed by VARCHAR, Lines served VARCHAR, Station users 2007/8 INT, Station users 2008/9 VARCHAR, Year opened VARCHAR, Platforms VARCHAR, Borough VARCHAR) CREATE TABLE reactor_data (reactor_data_id AUTO_INCREMENT PRIMARY KEY, Unit VARCHAR, Reactortype VARCHAR, Net capacity VARCHAR, Gross capacity VARCHAR, Construction started VARCHAR, Electricity Grid VARCHAR, Commercial Operation VARCHAR, Shutdown VARCHAR)  
SELECT District FROM  WHERE Incumbent = Riley Joseph Wilson